package com.sky.service.impl;

import com.alibaba.fastjson.JSON;
import com.alibaba.fastjson.JSONObject;
import com.sky.constant.MessageConstant;
import com.sky.dto.UserLoginDTO;
import com.sky.entity.User;
import com.sky.exception.LoginFailedException;
import com.sky.mapper.UserMapper;
import com.sky.properties.WeChatProperties;
import com.sky.service.UserService;
import com.sky.utils.HttpClientUtil;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.stereotype.Service;

import java.time.LocalDateTime;
import java.util.HashMap;
import java.util.Map;

@Service
public class UserServiceImpl implements UserService {

    //定义微信接口服务开放平台的网址
    private static final String WX_LOGIN = "https://api.weixin.qq.com/sns/jscode2session";

    @Autowired
    UserMapper userMapper;

    @Autowired
    WeChatProperties weChatProperties;


    @Override
    public User wxLogin(UserLoginDTO userLoginDTO) {
        //获取openid
        String openid = getOpenId(userLoginDTO.getCode());
        //判断openid是否为空
        if(openid.isEmpty()){
            throw new LoginFailedException(MessageConstant.LOGIN_FAILED);
        }
        User user = userMapper.getByOpenid(openid);
        //如果是新用户，则添加到数据库
        if(user == null){
            user = User.builder()
                    .openid(openid)
                    .createTime(LocalDateTime.now())
                    .build();
            userMapper.insert(user);
        }
        return user;

    }

    private String getOpenId(String code){
        //调用微信接口服务，获得当前用户的openid
        Map<String,String> map = new HashMap<>();

        //通过HttpClient向微信接口服务发送请求，并携带三个参数appId+appSecret+code
        map.put("appid",weChatProperties.getAppid());
        map.put("secret",weChatProperties.getSecret());
        map.put("js_code",code);
        map.put("grant_type","authorization_code");
        //从微信接口开放平台获取返回的数据（json格式），里面包含session_key和openId等
        String json = HttpClientUtil.doGet(WX_LOGIN,map);
        JSONObject jsonObject = JSON.parseObject(json);
        //获取返回数据中的openId，是微信用户的唯一标识
        String openid = jsonObject.getString("openid");
        //返回openid
        return openid;
    }
}
